6.2 With the graduated cylinder, measure 100 mL of sample
at room temperature into the conditioned platinum evaporating
dish (see 4.2); place on a steam bath or a hot plate in a fume
hood and evaporate. Warning—Since aliphatic hydrocarbons
have low autoignition temperatures, only efficient hoods
should be used.
NOTE 2—Precision data were obtained only with evaporation using
steam bath.
6.3 Return the dish and contents to the oven for 15 to 30
min, cool, and reweigh. Repeat, if necessary, until the weight is
constant to within 0.1 mg of the previous weighing.
7. Report
7.1 Report as nonvolatile matter the residue obtained from
the specimen as milligrams of nonvolatile residue/100 mL